1. Lesson 12: Blood flow Objective: - Heart’s and body’s blood supply - Components of blood

2. http://www.britannica.com/EBchecked/topic /95628/human-cardiovascular- system/33561/Blood-supply-to-the-heart

3. Coronary Blood supply There are two main coronary arteries: the left main coronary artery and the right coronary artery which come from the aorta. The left main coronary artery divides into the left anterior descending branch and the left circumflex arteries. Each artery supplies blood to different parts of the heart muscle and the electrical system.

6. Blood Plasma: Pale liquid that carries all the other parts of the blood, nutrients, CO2, urea, hormones and antibodies White blood cells: Defends against disease, make antibodies and antitoxins Platelets: Have no nucleus, help clot bleeding Red Blood Cells: Carry Oxygen and iron. They have no nucleus

7. Parts of the Circulatory System Arteries: - carry oxygenated blood away from the heart - Leaves the heart at high pressure, so the walls are thick, strong and elastic - Narrower “lumen” or canal - EXCEPTION: pulmonary artery Capillaries: - Are very small, one cell thick - Diffuse food and oxygen to body tissues - Take CO2 and urea away from body tissues

8. Veins - Take blood back to heart - Blood has lower pressure so the walls are thinner - Larger “lumen” or tube to carry the blood - Have valves to keep the blood flowing in the right direction - EXCEPTION: pulmonary vein

10. Microscopes Start at one of the microscopes. Observe the slide, write down the stations’ number and what you are observing. After 2 minutes rotate clockwise until you have seen all of the slides.

12. Homework Crossword and question sheet